I need a 2nd video card for my new system to run along side a 4870. I tried putting my old 7300GT in slot #4 and I'm not getting any video from it. (?) Must be a compatability issue.... (?) Wont boot in SL or L Does slot 3 make a difference? Any way.. Would like to find something silent. I don't mind using a PC card in the mac... Any suggestions? • GT120 • 2600xt?? Thx!